If you have say an American 5000 series. It will have a mix of serrated and spool drivers, and most likely all the key pins will be serrated as well. Once you've picked the lock and can do so without too much struggle, take it apart and move the drivers around. You won't need to re-key because the key pins remain the same.
What you'll accomplish is to change the setting order of the pins. Same lock - different setting order - different pick. Just like having a different lock, except this one didn't cost you anything .... You may be surprised at how just swapping two pins can change the complexity of the pick. It may be easier than the factory pinning, or you may find it to be more challenging.
All you'll need is a Phillips screwdriver to remove the cylinder, a pair of tweezers and a plug follower to keep from spraying pins and springs as you take 'em out.
If you're new at repinning, you might consider putting both hands and the core into a gallon plastic bag. That way, if you shoot some pins and springs, they won't go far ....
Along the way, you'll learn a new skill (repinning) while you're saving some cash.
There are lots of videos on YouTube on how to "gut" and re-pin locks. Suggest you take a gander at one or two just to get the steps down before you start the first tear-down. I didn't have that luxury, and of course I sprayed pins and springs like a load of #4 shot out of a duck gun....
Have fun !!